IRF3515S N-Channel 150V 41A MOSFET Equivalent & Substitute Parts

Part Overview

The IRF3515S is an N-Channel MOSFET manufactured by Infineon Technologies, rated for 150V drain-to-source voltage with 41A continuous drain current at 25°C. This device is housed in a D2PAK (TO-263-3) surface mount package and is designed for high-efficiency switching applications requiring moderate current handling and thermal performance up to 200W.

The IRF3515S is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support legacy system maintenance or redesign initiatives.

Substiute Parts

IRF3515S

Infineon TechnologiesIn Stock: 1497IRF3515S Datasheet

Current PartRFQ

IRFS4228PBF

Infineon TechnologiesIn Stock: 2368IRFS4228PBF Datasheet

MFR RecommendedRFQ

AOB254L

Alpha & Omega Semiconductor Inc.In Stock: 10209AOB254L Datasheet

MFR RecommendedRFQ

IXTA62N15P

IXYSIn Stock: 1439IXTA62N15P Datasheet

MFR RecommendedRFQ

STB75NF20

STMicroelectronicsIn Stock: 1438STB75NF20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the IRF3515S is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Drain-to-Source Voltage (Vdss): Must equal or exceed 150V
• Package Type: Must be D2PAK (TO-263-3) or compatible surface mount variant
• Continuous Drain Current (Id): Must meet or exceed 41A at 25°C
• On-Resistance (Rds On): Should not significantly exceed 45mOhm to maintain thermal efficiency
• Gate Threshold Voltage (Vgs(th)): Must be within acceptable switching range (typically 2.7V to 5.5V @ 250µA)
• Operating Temperature Range: Must support -55°C to 175°C minimum
• Mounting Type: Surface mount configuration required

Secondary Compatibility Parameters:

• Gate Charge (Qg): Lower values reduce switching losses
• Input Capacitance (Ciss): Affects gate drive requirements
• Power Dissipation Rating: Higher ratings provide thermal margin

The substitute parts listed below satisfy these criteria within the allowed parameter ranges for N-Channel MOSFET technology.

Parameter Comparison

Engineering Selection Recommendations

IRFS4228PBF (Infineon Technologies)

The IRFS4228PBF is a direct manufacturer upgrade from Infineon, maintaining the same 150V Vdss rating and D2PAK package. It provides doubled continuous drain current (83A vs. 41A) and significantly improved on-resistance (15mOhm vs. 45mOhm), resulting in lower thermal dissipation. However, this part is also classified as obsolete. ROHS3 compliance provides regulatory advantage over the IRF3515S. Selection is appropriate when higher current capacity and improved efficiency are acceptable design modifications.

AOB254L (Alpha & Omega Semiconductor Inc.)

The AOB254L maintains 150V Vdss and D2PAK package compatibility with active product status, ensuring long-term availability. Continuous drain current is 32A (Tc), slightly below the IRF3515S specification. On-resistance is comparable at 46mOhm. Gate charge is significantly lower at 40nC, reducing switching losses. ROHS3 compliance and unlimited moisture sensitivity level (MSL 1) support modern manufacturing requirements. This part is suitable for applications where supply continuity and regulatory compliance are prioritized over current capacity.

IXTA62N15P (IXYS)

The IXTA62N15P maintains 150V Vdss and TO-263AA package compatibility with active product status. Continuous drain current is 62A (Tc), exceeding IRF3515S capability. On-resistance is improved at 40mOhm. Gate charge is 70nC, moderately higher than AOB254L but lower than IRF3515S. ROHS3 compliance and operating temperature range of -55°C to 175°C match the original specification. Selection is appropriate for applications requiring higher current handling with maintained voltage rating.

STB75NF20 (STMicroelectronics)

The STB75NF20 provides the highest continuous drain current at 75A (Tc) and improved on-resistance at 34mOhm. However, Vdss is rated at 200V, exceeding the 150V requirement. Operating temperature range is -50°C to 150°C, which does not extend to the full -55°C lower limit of the IRF3515S. D2PAK package and ROHS3 compliance are maintained. This part is suitable only when the higher voltage rating and reduced lower temperature limit are acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can the IRFS4228PBF directly replace the IRF3515S in all applications?

A: The IRFS4228PBF maintains identical voltage rating (150V) and package type (D2PAK), with superior current capacity and on-resistance. However, both parts are obsolete. Direct substitution is electrically valid, but the higher current rating and lower on-resistance may require circuit verification to ensure gate drive compatibility and thermal management remain appropriate.

Q: Why is the AOB254L recommended despite lower current rating (32A vs. 41A)?

A: The AOB254L is the only substitute with active product status, ensuring long-term supply availability. The 32A rating is within 78% of the original specification. For applications operating below 32A continuous current, this part provides regulatory compliance (ROHS3) and manufacturing support advantages. Applications requiring the full 41A capacity should select IXTA62N15P or IRFS4228PBF.

Q: Is the STB75NF20 suitable as a substitute?

A: The STB75NF20 is electrically compatible in terms of package and gate characteristics. However, the 200V Vdss rating exceeds the 150V requirement, and the operating temperature range does not extend to -55°C. Substitution is valid only when the higher voltage rating does not create design conflicts and the -50°C minimum temperature is acceptable.

Q: What is the impact of different gate charge (Qg) values on circuit design?

A: Gate charge affects switching speed and gate drive power requirements. The AOB254L (40nC) requires lower gate drive energy than the IRF3515S (107nC), potentially reducing switching losses. The IXTA62N15P (70nC) and STB75NF20 (84nC) fall between these values. Gate drive circuits must be verified to ensure adequate voltage and current delivery for the selected substitute.

Q: Are all substitute parts RoHS compliant?

A: The IRF3515S is RoHS non-compliant. All four substitute parts (IRFS4228PBF, AOB254L, IXTA62N15P, STB75NF20) are ROHS3 compliant, meeting current environmental and regulatory requirements for new designs and manufacturing.

Q: What is the significance of product status (Active vs. Obsolete)?

A: Active products have ongoing manufacturer support, documented availability, and long-term supply commitment. Obsolete products have limited or no future availability. The AOB254L and IXTA62N15P are active, providing supply security. The IRFS4228PBF is obsolete, similar to the original IRF3515S, and should be selected only when current capacity upgrade justifies the obsolescence risk.

Q: Can package variants (D2PAK vs. TO-263AA) be used interchangeably?

A: D2PAK and TO-263-3 are equivalent designations for the same physical package. TO-263AA is a variant of the same family with identical pin configuration and thermal characteristics. All listed substitutes are mechanically compatible in D2PAK footprints. PCB layout verification is recommended to confirm pad alignment.

Q: How should on-resistance (Rds On) differences affect component selection?

A: Lower on-resistance reduces conduction losses and heat generation. The STB75NF20 (34mOhm) and IRFS4228PBF (15mOhm) offer significant improvements over the IRF3515S (45mOhm). For high-frequency or high-current applications, lower Rds On reduces thermal stress. For low-current applications, the difference may be negligible, and other factors such as availability and compliance become primary selection criteria.